It would be good if you can set up a purchase order directly from an Invoice, like you can on the sales order section.
This Tool from Adept can create a PO from an Invoice or Sales Order https://www.adepttools.co.uk/adept-sage-50-back-to-back-ordering/
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This Tool from Adept can create a PO from an Invoice or Sales Order https://www.adepttools.co.uk/adept-sage-50-back-to-back-ordering/